Actually, it might be more of an indicator than we think. The fact is, by your post, you're showing that you just don't understand the whole topic. If I said some choice words to your mother, then looked at you and said, hey, it's just words, pal...how would you react. If you weren't infuriated, then you've got no respect for her.
You probably think drugs should be legalized too, right? Hey it's your body.
Should we be allowed to manufacture bombs too? Free country, right?
The big question was this: Is it necessary to use profanity to communicate? The answer is obviously no, which means you are making a conscious decision to cuss every time you do.
There's gotta be a place where you would hold your tongue (if not, you've got big problems). How about church? Maybe you attend, but my guess is you don't. Maybe on Christmas? How about a wedding. Ok, during that wedding, you trip and fall right in front of everyone. You going to be dropping the F-Bomb? No, you'll exercise some control in that extreme situation.
Now when you go on down the line of settings, you very quickly come to the atmosphere where you let the words fly. So there is a line somewhere, albeit very far up towards the right. Thus, you choose.
Now, if you're going to go back to the "programmed automatic" argument, then you're just saying that you don't have control over yourself, which may be more evidence of the indicator we spoke of above.